Oil burner



June- 11, 1935.

AIR. STEVENSON, JR bIL'BURNER Filed Feb, 28, 1951 v 7 Inventor: Alexander- R. Stevenson Jn,

W/QYM .His Attorneg Patented June 11, 1935 A e e QI-LBUKNER W 1 g R. Stevenson, in, Schenectady, N. Y,

. assignor toTGeneral Electric Company, a cornotation of New York Application My invention relates to oil burners, more par-i ticularly the motor blower and compressor devices used for supplying oil and air to the'nozzle of the oil burner. v

It is known that oil burner motor blower units set up a noise and vibration during operation and no means has heretofore been provided for overcoming this objection. In oil burners of the type disclosed in an application oi Elliott D. Harrington, filed Janaury'2l, 1930, Serial No.422A49 assigned to the same assignee, the oil burner blower compressor unit is mounted on top of the furnace proper with the result that there is noise from the unit.

Hence it is a principal object of my invention to provide a means for eliminatingnoise and. vibration due to operation of motor blower units used in oil burners.

Briefly, the preferred embodiment of my invention consists of a closed housing or casing for surrounding the blower compressor unit which is mounted on top of an oil burner furnace. This casing acts as an insulator for noise from the unit. It is necessary, however, to provide an opening to the housing in order that the blower may be supplied with necessary air from the outside of the burner to provide for combustion within the oil burner proper. This is accomplished by the use of a long tubular member having an opening near the floor from which the blower unit is supported. This tubular member extends the length of thebumer and opens into the casing surrounding the oil burner unit thereby supplying the necessary air but preventing noises from leaving. By placing the intake-near the floor any faint noises which may find their way to the exterior of the tube are minimized since it is placed below the level of the ear of an observer, it being apparent that when noise issues from a source at a height near an observers ear the noise will be more pronounced. The casing and the tube provide a sonic filter action to prevent noise which action will be more fully described below. Vibration of .the unit is absorbed by means of a resilient mounting. In addition, due to the sub-atmospheric pressure in the casing covering the compressor unit any oil fumes passing up through the top of the furnace are prevented from leaving the casing and contaminating the atmosphere of the room in which the furnace is placed. Should the compressor unit catch fire for some unusual reason, the cover acts to smother the flame.

Referring to the drawing, Fig. 1 shows an embodiment of my invention applied to an oil burn- February 28, 1931 serial no.

1* Claim. (61.15841) eriurnace andFig. 2 shows a'iesilient mounting rorthe compressor unit. I a I (In Fig. l. the oil burner is generally designated by the numeral l0. Resiliently mounted on top of the furnace, is the blower com ressor unit ll whichis electrical-1y driven. This unitfiis resiii- 'ently'su'pported upon the rods Is by means or the resilient supporting elements 18 which are shown more in detail inrigrz. A'casing- 20 surrounds the unit. Oil imder pressure is supplied to the unit by means (if the conduit '1 2 flfld the electrical eonduitsior energizing the motor of the unit are shown at It. I Botn theseconduits extend up through the intake tube or duct [4 which supplies air from the exterior of the casing to themterior of the casing so that the blower l5 may deliver this air through the conduits l6 and H to the burner proper.

1 In Fig. 2 the resilient mounting is designated generally at I8. Rigid rods I9 attached to .the top of the burner supports the motor blower compressor unit. Attached to this rod is a cupshaped member 22 by which are supported the resilient members 23 which in turn support the reversed cup-shaped member 24 and the member 25, the member 25 in turn supporting the blower compressor unit I l Vibrations which result from operation of the burner unit are absorbed by the resilient members 23. This prevents noise vibrations from being transmitted to the exterior of the casing through the support and body of the furnace upon which the com pressor unit is mounted.

The operation of the motor blower compressor unit sucks in air through the tubular member I4 and the blower It then discharges it through the conduits l6 and I! to the interior of the oil burner. The casing 20 which surrounds the unit acts as a reservoir analogous to an electric circuit having capacity and the member M as an inductance. The air going through. the long pipe has inertia similar to the stored energy in an inductance. This prevents sound wavesfrom. issuing from the casing 20 through the pipe l4 to the exterior of the casing. Thus the combination of the casing and the intake tube l4 have the characteristics of what might be termed a. sonic filter, that is, a mechanism for filtering or preventing noise from issuing from the blower compressor unit to the exterior of the casing while the unit is in operation. In actual practice the noise has been practically eliminated, very little noise or vibration finding its way to the outside of the casing. It also has been found in actual practice that upon operation of the shown in Fig. 1 extends downwardly near the floor upon which the boiler furnace I is set.

It also has been found in practice that withthe interior of the casing 20 and the top of furnace I0 maintained at sub-atmosphericpressure as just described any leakage of oil fumes or'vapors from the motor compressor unit II or from the piping interconnecting the unit .I I with the boiler furnace ID are drawn from the interior of the casing 20 along with the air and discharged into the interior of the w oil burner; This effectively prevents the escape of these undesirable fumes and vapors Q-into the atmosphere .aroundqthe boiler furnace. 1,; I

- Furthermore, it, hasbeen found in practice that the arrangement of the closed casing-ZO-around the unit, llpon top of furnace I0 withthe long downwardlyextending, air inlet; pipe I4 forms 3.

- trap for any fumes: or vapors'which may escape from the unit ,II theinterconnecting piping'with the boiler furnace, orfrom thetop of the furnace itself even during: the period when the electric motor driven compressor unit I I is not operating.

As soon as the unit is started operating, the trapped fumes and vapors are drawn alongwith the air inside of the casing 20 and discharged into the interior of the combustion chamber of the boiler furnace III.

'I'heembodiment of the invention illustrated and described herein has been selected for the purpose of clearly setting forththe principles involved. 'Itwill be' apparent; however, that the invention is susceptible of being modified to meet the different conditions encountered in its use, and I, therefore, aim to cover by the appended claim all of the modifications within the true spirit andscope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

In combination, an oil furnace having an electric motor driven blower pump unit mounted upon the top thereof for supplying air and oil thereto, a casing mounted upon the top of said furnace and forming therewith a closed housing surrounding said unit with the blower intake opening, into the interior of said housing'to reduce the pressure therein below atmospheric and exhaust oilvapors and, fumes therefrom, and an inlet. for. said casing. comprising a tubular air duct of restricted cross section extending down,

wardly from said casing and opening adjacent the base of-said furnace whereby air is admitted to the casing and the operating noise of said unit is substantially suppressed u- ALExANDERRts'rEvENsoN, JR. 

